Gas burner



Jam 1940. A. .1. ANDERSON ET AL 2,137,574

GAS BURNER Filed Nov. 8, 1937 W IIIlElIr Patented Jan. 16, 1940 PATENTOFFICE GAS BURNER Alfred John Anderson and George Hill, Takapuna,Auckland, New Zealand, assignors to Dorothy Bennett, Vivien Jacobsen,

Arthur David Leonard Griffiths, and themselves, all of Auckland, NewZealand Application November 8, 1937, Serial No. 173,510 In New ZealandNovember 14, 1936 5 Claims.

Theinvention relates to gas burners of the type comprising a bowl towhich gas and air are admitted to form a combustible fuel mixtureadapted to pass upwards through, and be ignited above,

5 a perforated top fitted to said bowl.

The object of the invention, is to provide improvements in the aforesaidtype of burner, in order to render same more efficient and economical ingeneraluse than existing burners of the 10 same type, the improvementsto be hereinafter described, being directed to the form of theperforated top, and to the provision of means in the bowl for ensuringthorough mixing of the gas and air to produce an efficient fuel mixture.

According to the invention the improved burner comprises a bowl providedwith a fuel inlet thereto; and also with a top containing apertures forthe passage of gas therethrough, said apertures tapering inwards andwidening in the direction of 20 the passage of the gas.

The apertures can be in the form of slots and in a practical form of theinvention, are arranged in circles around a downwardly tapering centralhole, also the top can be fitted directly onto the 28 bowl, or over aperforated plate secured thereon, said bowl containing a number ofbafile bars or plates placed across its interior at varying angles.

In the accompanying drawing in conjunction with which the invention willbe more particu- 30 larly described:

Figure 1 is a sectional elevation, and

Figure 2 a plan view of the improved burner, while Figure 3 is a partsectional elevation of a modified form thereof,

Figure 4 is a part perspective view of the perforated top, and

Figure 5 illustrates one way of securing the top on the bowl.

In the drawing, 1 represents a pipe through whichgas mixed with therequisite amount of air to promote combustion, is fed to a bowl 2, theinterior surface of which is vertical and perfectly straight.

The bowl 2 is preferably enlarged or thickened around its upper edge asat 2a, the enlargement being screw threaded or left plain as required.

The top to the bowl 2 is formed with a downwardly depending ring 3 whichcan be screw threaded to screw on to the enlargement 2a. if the latteris screw threaded, or if said enlargement 2a is left plain, the ring-3has formed therein any desired number of open ended bayonet slots 4 55adapted to pass upon pins .5 which project from the enlargementla. forthe purpose of securing said top on the bowl 2.

The upper or covering portion 6 of the top can be formed of metal or ofany suitable heat resisting material fitted into the ring 3, saidportion 6 5 containing a central downwardly tapering hole 1, an innerring of slotted aperturesa, and an outer ring of slotted apertures 9,while on its under side, said portion 6 has a downwardly depending ringI0.

Both the slotted apertures 8 and 9 taper inwards or towards the centralhole 1, and taper inwards or widen outwards through the portion 6.

The bowl 2 contains two or more baiile bars or plates H of suitablecross section, placed at varying angles across its interior.

Instead of being fitted directly onto the bowl 2 as illustrated inFigures 1 and 2, the apertured top just described can be used over or inconjunction with a perforated and slotted plate I2 having an inverteddome formation 12a, depending from its underside and retained on thebowl 2, by means of a flanged ring l3 either adapted to screw on to theenlargement 2a, or to be retainedthereon by means of bayonet slots andpins.

In the last described form of burner the improved top comprising thering 3 and upper or covering portion 6 can be formed and fitted so thatthe lower edge of the ring 3 will fit between the upper edge of theplate I! and the inner edge of the flange retaining ring l3, so thatwhen the latter is tightened or secured on the enlargement 2a, it willalso secure the apertured top consisting of the ring 3 and the portion 6over the plate l2.

If desired the ring 3 of the apertured top can be made large enough tosurround the flanged retaining ring 13, in which case the ring 3 can bescrew threaded internally to screw onto an external screw thread on thering I3, or said ring can contain bayonet slots to pass upon pinsprojecting from the ring I3.

The tapering of the slots 8 and 9 in the upper or covering portion ofthe top, downwards to a slit, has the effect of preventing back firingor ignition of the gas below said portion 6, when lighting the burner,also the expansion or widening of the slots 8 and 9 upwards or in thedirection of flow of the gas passing through said portion 6 allows thegas to expand and produce a flame of large area for heating purposes.

When the improved top herein described, is fitted over the perforatedplate l2, a further mixing chamber I4 is provided between the latter andthe top, while the provision of the baflle bars or plates II in the bowl2, ensures the gas being deflected during its passage therethrough in amanner which ensures complete mixing with the air admitted to supportcombustion.

What we do claim and desire to obtain by Letters Patent of the UnitedStates of America is:

1. A gas burner comprising a bowl having a fuel inlet, a plate havingapertures therein located on said bowl, a top located over said plateand spaced therefrom to provide a chamber between said top and saidplate and said top having apertures tapering radially and widening inthe direction of the passage of the gas.

2. A gas burner as set forth in claim 1 in which a ring is provided onsaid top and a flanged retaining ring is associated with said plate inorder to secure said ring on said top between said plate and saidretaining ring.

3. A gas burner comprising a bowl having a fuel inlet, a plate havingapertures therein disposed on said bowl, a flanged retainingringassociated with said plate having a threaded portion thereon, a toplocated above said plate, a ring on said top screwing onto said threadedportion and said top having apertures therein tapering radially andwidening in the direction of the flow of gas.

4. A gas burner comprising a bowl having a fuel inlet, a plate havingapertures positioned on said bowl, a flanged retaining ring associatedwith said plate having pins projecting therefrom, a top located oversaid plate having apertures therein tapering radially and widening inthe direction of the flow of gas and a ring on said top having bayonetslots therein cooperating with said pins.

5. A gas burner as set forth in claim 4 in which said bowl is providedwith baflles extending transversely therein at varying angles.

GEORGE HILL. ALFRED JOHN ANDERSON.

